HLS Manifest Parsing Issues

[rymusg]

Have you read the FAQ and checked for duplicate open issues?
Yes

If the problem is related to FairPlay, have you read the tutorial?

N/A

What version of Shaka Player are you using?

4.12.5

Can you reproduce the issue with our latest release version?
Tested using 4.12.5

Can you reproduce the issue with the latest code from main?
Tested using 4.12.5

Are you using the demo app or your own custom app?
Demo app and my own app

If custom app, can you reproduce the issue using our demo app?
Yes

What browser and OS are you using?
Windows 11, Edge, Firefox, Chrome

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
N/A

What are the manifest and license server URIs?

Manifest URI: https://cdn-dynmedia-1.microsoft.com/is/content/microsoftcorp/RF-Microsoft-M365-Sizzle_video_en-us-AVS.m3u8
License Server: N/A

What configuration are you using? What is the output of player.getNonDefaultConfiguration()?

{\n "streaming": {\n "ignoreTextStreamFailures": true\n }\n}'

What did you do?

In Shaka Demo App, use this manifest: https://cdn-dynmedia-1.microsoft.com/is/content/microsoftcorp/RF-Microsoft-M365-Sizzle_video_en-us-AVS.m3u8

Play the video
Observe between 20 and 25 seconds, the video will skip. In firefox, the duration of the video in the UI will change from 38 to 37 seconds.

Note that this same manifest does not have the issue in other players (e.g. here: https://hlsjs.video-dev.org/demo/ or in windows media player).

What did you expect to happen?
Video should not skip.

What actually happened?

Video skips, and in some cases the duration updates.

Are you planning to send a PR to fix it?
No